Abrasion Testing
Run to five thousand rubs, weigh, and project. Abrading all the way to failure costs a week and tells you the same thing.
— no.
Projected from the measured loss rate
Linear extrapolation holds while abrasion stays in the steady phase. Fabrics with a pile, a coating or a surface finish lose the surface fast and then slow down, so a projection made from an early interval will be pessimistic — take the interval past the run-in.
Martindale Abrasion Weight Loss Extrapolator — free, with the formula and a worked example, at Textile School.